Hi, I'm suffering from a very strange thing, about which I can't find any information on Google. Please help me.

My software information:

OS: Windows 8 64bit

Photoshop: Adobe Photoshop CS6 (Adobe CS6 Master Collection)

As you can see from the screenshot below, after checking the "Shape Dynamics", I still can't change anything about "Size Jitter", nor can I change "Roundness Jitter", as they already become grey and not dragable or clickable.

Under this condition, my drawing tablet can't be pressure-sensitive in Photoshop CS6 64bit, but it can be pressure-sensitive in Photoshop CS6 32bit and other applications.

Is this problem relavant to my tablet driver or to my Photoshop installation? I am hesitated to reinstall my Photoshop because the whole Master Collection takes quite a long time to complete installation.

I am having a similar problem and resetting the brushes isn't helping. I've checked the brushes, and the size jitter suddenly becamne unavailable to a brush that waas capable of doing it previously. All my point brushes no longer have the size jitter available!! I really don't know what to do, but I'm really not thinking of having to re-install photoshop. It must be something small, something I'm missing. My screen shots would be the same SunJizu otherwise. I can't even toggle the 'always use pen pressure' icon in the top options bar. It's unavailable.

Even I'm facing a similar problem. I bought an Intuos 3D recently and when i try to adjust the pen pressure in photoshop its not working properly. As you can see in the image above, I'm able to edit the Control of Shape Dynamics but even after changing it to 'Pen Pressure' its not recognising pen pressure. (Check the line drawn in the canvas) There is a small alert kinda icon on the left side of "Controls" . I dont know what it indicates. Please someone help! Thanks in advance